Electromagnetic field detectors and radiomonitoring
The devices called electromagnetic field (EMF) or radio frequencry (RF) detectors are the devices, intended for detection and localization of overhearing devices, radio microphones. The field detectors, as a matter of fact, are the broadband high frequency amplifiers and they react to any signal in effective range of frequencies. The detectors models differ by service functions: by effective range of frequencies, availability of "acoustic feedback", capability of frequency measurement, kinds of indication, design. The search for listening devices with usage of RF detectors is conducted as follows: electromagnetic field is detected and the listening device is located by analyzing its field intensity.